Ticket #13471: 13471.diff

wp-includes/canonical.php

@@ -180 +180 @@
 
                         }
                 } elseif ( is_single() && strpos($wp_rewrite->permalink_structure, '%category%') !== false ) {
-                        $category = get_term_by('slug', get_query_var('category_name'), 'category');
+                        $segment = explode( '/', get_query_var( 'category_name' ) ) ? end( explode( '/', get_query_var( 'category_name' ) ) ) : get_query_var( 'category_name' );
+                        $category = get_term_by('slug', $segment, 'category');
                         $post_terms = wp_get_object_terms($wp_query->get_queried_object_id(), 'category', array('fields' => 'tt_ids'));
                         if ( (!$category || is_wp_error($category)) || ( !is_wp_error($post_terms) && !empty($post_terms) && !in_array($category->term_taxonomy_id, $post_terms) ) )
                                 $redirect_url = get_permalink($wp_query->get_queried_object_id());